To estimate the price of the 2018 Hyundai Elantra I4 2.0L Smart (Base) with 220,000 km mileage, I focused on the selling prices of similar cars. The most relevant data point is a 2019 Elantra I4 2.0L Smart (Base) with 200,000 km sold for 39,000 SAR on 2023-07-19. Considering the 2018 model is a year older and has higher mileage, its value would be slightly lower. A 2017 Elantra I4 2.0L Smart (Base) with 114,000 km sold for 44,000 SAR on 2023-06-01, but the mileage difference is significant. A 2018 Elantra I4 2.0L GLS (Top) with 80,000 km sold for 50,000 SAR on 2024-05-10, indicating higher trim value. Considering these factors, the estimated price for the 2018 Elantra I4 2.0L Smart (Base) is adjusted to account for its higher mileage and base trim.